I have been reading alot of the post on shooting form and have picked up some great info, thanks.  My issue is after shooting awhile it seems like all of a sudden my shots go left of what I am aiming at.  I am a right handed shooter, and shoot a 58" hybrid style longbow.  I can be at a 3D shoot and shooting great, putting arrows right where I am looking and then they start to go left.  I can't determine what I am doing it happens at my home practice range as well.  Can you give me some ideas what to look for?  If you need more info let me know.
Thanks
ALDO

Probably lack of back tension.  If I throw one a bit left, that's usually why.  You might be fatiguing as you shoot, loosing your proper alignment.

Thanks Terry, I will keep that in mind next practice session.

Your follow through is a great indicator of what you did right or wrong.

If your accuracy is sufering AFTER you have been shooting for a while...it's prpbably do to fatigue and you either aren't getting proper back tension or maintaining the proper tension in your bow arm and bow shoulder.

Ray  

Appreciate the suggestion Ray, I will be at it again today and will see how it works out.   I did a lot of shooting between Sat and Sunday this weekend and the fatigue thing may be accurate.  
Thanks
ALDO